Shop › Limescale Filter Replacement Image 1 of 1 Limescale Filter Replacement £29.95 Replacement Filter Limescale for your 3 in 1 boiling water tap. Frequency: One time purchase £29.95 Subscribe Save 10% Sale Price: £26.96 Original Price: £29.95 Every 6 months Add to Cart Added! Replacement Filter Limescale for your 3 in 1 boiling water tap.